Abstract

We observe magnetic domain structures of MgO/CoFeB with a perpendicular magnetic easy axis under an electric field. The domain structure shows a maze pattern with electric-field dependent isotropic period. The analysis of the period indicates a major role of the electric-field modulation of interfacial magnetic anisotropy for the observation and possible contribution from electric-field modulation of the exchange stiffness constant.

Received 27 March 2016Accepted 15 July 2016Published online 22 July 2016

Acknowledgments:

This work was supported in part by R&D Project for ICT Key Technology of MEXT and Grants-in-Aid for Scientific Research from JSPS (No. 26889007) as well as MEXT (No. 26103002). TD acknowledges support from GP-Spin at Tohoku University.

Abstract

We observe magnetic domain structures of MgO/CoFeB with a perpendicular magnetic easy axis under an electric field. The domain structure shows a maze pattern with electric-field dependent isotropic period. The analysis of the period indicates a major role of the electric-field modulation of interfacial magnetic anisotropy for the observation and possible contribution from electric-field modulation of the exchange stiffness constant.

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Effect of electric-field modulation of magnetic parameters on domain structure in MgO/CoFeB